Tech Measured Wrong?

Emily • 21, Married to my love🌹Army Wife 💍 Angel mom of 4

After seeing other people's ultrasounds at 5w5d and 6w0d, I'm angry because I'm pretty sure that the tech measured me wrong!! I was supposed to be 7w5d but she measured me at 5w5d! But when I saw the ultrasound, inside of the black sac was a nice sized white blob. It was really there. Has this happened to anyone else?